<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742016000100072</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Secular variation and excursions of the Earth magnetic field during the Plio-Quaternary: New paleomagnetic data from radiometrically dated lava flows of the Colima volcanic complex (western Mexico)]]></article-title>
<article-title xml:lang="es"><![CDATA[Variación secular y excursiones del campo magnético terrestre durante el Plio-Cuaternario: nuevos datos paleomagnéticos de flujos de lava fechados radiométricamente del complejo volcánico de Colima]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Ruiz]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goguitchaichvili]]></surname>
<given-names><![CDATA[Avto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Solano]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cortés-Cortés]]></surname>
<given-names><![CDATA[Abel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Contreras]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maciel-Peña]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosas-Elguera]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Macías-Vázquez]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Escuela Nacional de Estudios Superiores Unidad Morelia ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro Universitario de Estudios e Investigaciones de Vulcanología  ]]></institution>
<addr-line><![CDATA[ Colima]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico Superior de Tacámbaro División de Investigación y Estudios Profesionales ]]></institution>
<addr-line><![CDATA[Tacámbaro Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad de Guadalajara  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>1</numero>
<fpage>72</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000100072&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000100072&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000100072&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Detailed rockmagnetic and paleomagnetic investigations were performed on selected lava flows from the Colima volcanic complex (CVC) located in the western sector of the Trans-Mexican Volcanic Belt. Reliable paleomagnetic directions were obtained from 21 Ar-Ar dated lava flows (205 standard paleomagnetic cores) within the age interval from 372 to 34 kyr. Ti-poor titanomagnetite is the main magnetic carrier in most of the samples, while some of them exhibit Curie temperatures ranging from 300°C to 340°C. Nineteen sites yielded normal polarity magnetization as expected from Brunhes Chron lavas, while two remaining lava flows show clearly defined transitional paleomagnetic directions. The mean direction, excluding the transitional data, is Dm=1.2°, Im=38.2° (k=39.5, &#945; 95=5.5°). The corresponding paleomagnetic pole is located at a longitude &#966;=270.1° and a latitude &#955;=87.6° (K=35.9, A 95=5.3°). This paleodirection is practically indistinguishable from the one expected for Pleistocene, as derived from the references poles for the stable North America. This suggests that no major tectonic rotation occurred in the studied area. The paleosecular variation is analysed through the scatter of virtual geomagnetic poles (VGP). The dispersion estimated through the parameter SF=13.0°, with an upper confidence limit SU=15.2° and a lower confidence limit SL=12.7° is consistent with the recent geomagnetic field models for the last 5 Myr. The present study yields the evidence of two "transitional" lava flows, whose age likely correspond to the Mono Lake or Laschamp excursion and to the Calabrian Ridge I or Portuguese Margin excursion, respectively.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se realizó una investigación detallada del magnetismo de rocas y paleomagnetismo en flujos de lava seleccionados del Complejo Volcánico de Colima (CVC), localizado en el sector oeste del Trans-Mexican Volcanic Belt. Se obtuvieron direcciones confiables de 21 flujos de lava datados por Ar/Ar (205 núcleos paleomagneticos estándares) dentro del intervalo de edad de 372 a 34 ka. El principal portador magnético en la mayoría de las muestras es titanomagnetita con un contenido pobre en Ti, mientras algunas de ellas exhiben temperaturas de Curie con rangos desde 300°C a 340°C. Diecinueve sitios produjeron magnetización de polaridad normal como es esperado para lavas correspondientes al Chron de Brunhes, mientras que dos flujos de lavas restantes muestran claramente direcciones paleomagneticas transicionales. Las direcciones medias, excluyendo los datos transicionales, son Dm=1.2°, Im=38.2° (k=39.5, &#945;95=5.5°). El polo paleomagnético correspondiente está localizado en la longitud &#966;=270.1° y una latitud &#955;=87.6° (K=35.9, A95=5.3°). Estas paleodirecciones son prácticamente indistinguibles de la esperada para el Pleistoceno, como se deduce de los polos de referencia estable para Norteamérica. Esto sugiere que no ocurre mayor rotación tectónica en el área estudiada. La variación paleosecular es analizada a través de la dispersión del polo virtual geomagnético (VGP). La dispersión estimada a través del parámetro SF=13.0°, con el límite de confianza superior SU=15.2°, y el límite de confianza inferior SL=12.7°, es consiste con los recientes modelos de campo geomagnético para los últimos 5 millones de años. El presente estudio proporciona evidencia de dos flujos de lava "transicional", cuya edad probable se corresponde con las excusiones de Mono Lake o Laschamp y Calambrian Ridge I o Portuguese Margin respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[paleomagnetism]]></kwd>
<kwd lng="en"><![CDATA[paleosecular variation]]></kwd>
<kwd lng="en"><![CDATA[excursion]]></kwd>
<kwd lng="en"><![CDATA[Colima volcanic complex]]></kwd>
<kwd lng="en"><![CDATA[Trans-Mexican Volcanic Belt]]></kwd>
<kwd lng="es"><![CDATA[paleomagnetismo]]></kwd>
<kwd lng="es"><![CDATA[variación paleosecular, excursión]]></kwd>
<kwd lng="es"><![CDATA[Complejo Volcánico de Colima]]></kwd>
<kwd lng="es"><![CDATA[Faja Volcánica Transmexicana]]></kwd>
</kwd-group>
</article-meta>
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